Universal drill socket or chuck.



No. 807,487. PATBNTED DBC.-19, v1905.

S. MCCLELLAN. UNIVERSAL DRILL SOCKET 0R CHUCK.

APPLICATION FILED APRA, 1904.

UNiTED STATES Pignnr orrron.

UNIVERSAL DRILL SOCKET OR CHUCK.

Specicaton of Letters Patent.

Patented Dec'lQ, 1905.

Application filed April 4,1904. Serial No. 201,510.

To all whom, it may concern:

Be it known that I, STEPHEN MCOLELLAN, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New f York, have invented certain new and useful Improvements in Universal Drill Sockets or Chucks, of which the following is a specification.

My invention is a universal drill socket or chuck, and is adapted to hold any of the usualshaped drills or bits, whether the shank be tapering, round, square, or octagonal; and it consists in a partially-threaded body having longitudinal grooves, spring-actuated jaws fitted in said grooves having a shank with an adjustable or reversible center plug in which the shank end of the drill or bit rests.

In the accompanying drawings, Figure 1 is a perspective view of my invention. Fig. 2 is a longitudinal sectional view. Fig. 3 is a cross-sectional view on the line y y of Fig. 2. Fig. 4 is a cross-sectional view on the line x of Fig. 2. Fig. 5 is a view, partly in section, of a modified form of my plug. Fig. 6 is a side elevation of one of the jaws and one of the teeth. Fig. 7 is a top plan view of the same. Fig. 8 is a cross-sectional view of Fig. 6 on the line z z; and Fig. 9 is a modification of the invention shown in Fig. 2, the rear end broken away.

My invention is described as follows: The numeral lrepresents the socket as a whole, in which 2 represents the shell or cap, said cap having a knurled surface 3 for a part of its length, beginning at its rear end. The other part and its nose 4 may be smooth. Said shell contains an internal thread 5 for part of its way, so that it may be screwed onto the body 6, which is provided with an external thread 7 for part ofits length.

The body 6 of the invention tapers nearly to a point, the tapering part thus adapted to fit in the nose part 4 of the shell. Said body is provided with three or more longitudinal grooves or recesses 8, in each of which is secured, by means of a screw 9, a flat spring 10.

j Hinged in each of said grooves is a jaw 11.

Said jaws are provided at their rear ends with elongated slots and are hinged through said slots by means of the screw-heads of screws 9, so that the front ends of said jaws may play up and down, the heads of said screws extending outwardly, forming short bolts 9'. Said socket, however, may be made with only two grooves and two jaws. The noses 12 of said jaws taper nearly to a point, and the forward ends of said jaws slope inwardly, forming teeth 13 and leaving a recess and shoulder 14. The said teeth 13 come to an edge 15, the purpose of the edges 15 of the teeth 18 of said jaws 11 being to enable the jaws to take a firm grip on the shank of the drill or bit. The purpose of the'recess and shoulder 14 is to allow the square part of the shank of the bit or drill to drop down behind said shoulder in case the bit or drill shank be square part of its length, as most of them are. The said jaws 11 have at their rear ends a perforation which are slightly elongated and larger than the end of screws 9, so that they fit over them loosely, so that when a drill is placed in the chuck and the shell is screwed down on the bevel ends of said jaws 11 they, itting loosely on said screwbodies, can gradually adjust themselves to the shape of said drill or bit shank, because the open or recessed parts of said jaws, that begin just in the rear of the heads, and the elongated perforations allowthis movement up and down.

The grooves that the jaws and springs iit in are a little deeper than the thickness of the stem of said jaws and the springs, thus al'- lowing an up-and-down movement of the rear ends of said stems. The grooves which the jaws fit in prevent any side movement, and

the fact that the stems of the jaws are long gives more surface to hold them in said grooves, while it does not interfere with its upand-down-adjustment movement. The screwbodies keep the jaws from dropping out when the shell is screwed on the stem.

The fact that the jaws and the springs are held in place by the same screws simplifies this invention and cheapens its manufacture, and much heavier springs and jaws can be used without enlarging the outside diameter of the chuck than can be used in other inventions of this kind.

The adjusting-plug working in the inside of the stem of the body and stem is a great advantage in using all lengths of drills and being adjustable without taking off the shell is very valuable in doing work quickly.

The body 6 has a cylindrical opening which extends from its front end nearly to its rear end, and then for a part of its way 17 said opening is square, its walls inclining inwardly intil they reach the recesses 19, described be- Extending immediately from the rear end IOO of the body is a flattened extension 18, provided with rectangular recesses or notches 19. Extending from the rear end of said attened extension is a shank 20, which is integralwith said flattened portion and is provided with a cylindrical opening 21, which reaches nearly to the rear end of said shank.

A plug 22, which consists of a straight cylindrical threaded bolt, works up and down iny the cylindrical opening 21 of the shank 20, through a nut 23, through the square opening 17, and forward part of way into the cylindrical opening 16 of the body. Said plug is provided at its front end with a small central depression 24 for centering and supporting the shank end of the bit or drill.

A linurled threaded nut 23 works on the threads of the plug 22 and turnsA in the recesses 19 of the iiattened extension 18 of the body. 25, Eig. 5, shows another form of a plug which. is used sometimes to take the place of the plug 22, mentionedl above. This plug cons-ists of cylindricalv rear end 26 and a square front end 27,r provided with a square hole 28, the cylindrical end being provided with a central depression 26. This plug may be made relatively shorter than is shown in the drawings. of this plug is turned forward, it is in position to center the shank end of small or short bits. When this plug 25 is used, itis notnecessa-ry to have the extension 18 and the knurled nut 23; but I can use the plug 25 by simply removing the plug 22, the flattened extension not being in the way and not interfering with the plug 25. The plug 25 is held inthe opening 16 17 by means of a screw 29. The said plug 25 is reversible, the cylindrical end being turned forward tocenter the end of the shank of the drill or bit when it is cylindrical When the cylindrical end 26 and the square end being turned forward to center the same when square.

The front ends of the jaws 11 and the teeth 15 are forced together and caused to bite the shank of the bit or drill by turning the shell rearwardly on the thread 7 of the body 6.

This universal drill-socket may be used on an ordinary hand breast-drill, or on .a common bit-stalk, or on a lathe or drill-press, or other machines of that character.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a universal drill-socket, consisting of means for graspinga drill or bit; a flat and recessed extension 18, and shank 20, extending from the rear end of said body, iat eX- tension and shank provided with a central opening 1617-21; a threaded cylindrical plug provided; with a centering-recess, fitting in and adapted to work up and down in said opening, and a nut 23,. working around said plug and in the recesses of said flat extension, substantially'as shown and described and for the purposes set forth.

2. Adrill-socket, comprising a body having long grooves in its outer surface, fiat springs in said grooves, and jaws in said grooves overlying said springs; screws, with which said jaws have a loose connection, said screwssecuring the springs to the body, and means for closing the jaws, substantially as shown and described and for the purposes set forth.

In testimony whereof I affix my signature in presence of two witnesses.

STEPHEN MCCLELLAN.

Witnesses:

B. C. TRo'r'r, CHARLES E. PERKINS. 

